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CK-12 Foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history
ck12.org Page Speed
ck12.org Resource Breakdown in Bytes Main HTML document and all iframes on the page 63,050 CSS resources on the page 247,812 Image resources on the page 671,356 JS resources on the page 1,305,953 Other resources on the page 55,438 Total size of all request bytes sent by the page 8,756
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ck12.org Resource Breakdown in Bytes Main HTML document and all iframes on the page 20 Text resources not covered by other statistics (i.e non-HTML, non-script, non-CSS resources) on the page 20 CSS resources on the page 20 Image resources on the page 20 JS resources on the page 20 Flash resources on the page 20 Other resources on the page 20 Total size of all request bytes sent by the page 20 ck12.org Mobile Page Speed ck12.org Mobile-Friendly
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